

                  Last Updates webKORIGEN

                       H. W. Wiese



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     New in Version 07.12.07

       * Errors in the 2200m/s cross section library (fission
         products) have been removed.

         To detect these errors, the KORIGEN subroutine PRIMAT
         (only used in the stand-alone webKORIGEN) was rewritten.
         PRIMAT is a powerfull tool for checking  nuclide
         transition data, especially cross sections depending
         on the selected facility (neutron spectrum) !

         PRIMAT generates file TRANBUN.o, containing nuclide
         transition decay constants (1/s) and cross sections
         (barn) for mothers and their daughters and/or vice versa.
         For fission product nuclides i and their actinide mothers
         j also the source coefficients yield(j->i)*sfiss(j) are
         listed. Furthermore, special attention is paid to
         open-end reactions, due to the fact that summation
         codes like KORIGEN do not cover the entire chart
         of nuclides.

         In a later version of webKORIGEN, it might be usefull
         to add, in case of target irradiation, the section of
         the concerned transition matrix to the LOG-file.

    !!   Comparison of the now used 2200m/s (thermal cross sec-
    !!   sections) taken of ORIGEN 22 (dated ca. 2004) shows
    !!   that they agree only roughly with the 2006 Karlsruhe
    !!   Chart of Nuclides. Should we think about an update ??

       * Flux irradiation of light nuclides (He3, Li6 -> Tritium,
         Co59 -> Co60) was checked. The fact of an increasing
         total mass during irradiation was analized : The outer
         neutron field acts as an  e x t e r n a l  source, each
         n-capture adding a n-mass to the total mass inventory !
         This effect is important for light targets, neglectable
         in case of heavy targets. A message is sent to the
         the LOG-file.

       * For target irradiation, now the target nuclide will be
         in the output in any case, even if it is not among the
         top-20 nuclides (subr. SORT)

       * Special treatment of alpha-particles HE  4 :
         HE 4 is created seperately from LE, AC and FP : In the
         top-20 data in many cases it apppeared twice and caused
         confusion because it was not clear why.

    !!   The numerical identifiers now contain information about
    !!   the nuclide group in which HE was generated.
    !!
    !!       Old : 20040/20000 for nuclides HE  4/elements HE
    !!
    !!       New : 20040+k/20000+k for nuclides HE  4/elements HE
    !!             k = 1/2/3 for LE/AC/FP

         Thus, e.g. 20042 means that HE  4 was generated from
         alpha-decays of actinides, 20001 : HE was generated from
         (a,n)-reactions (mainly) of LE, e.g. during irradiation
         of LI  6 (fusion reactor).

    !!   Conversion of the numerical identifiers to alphameric
    !!   names for HE has to account for this special treatment !!

       * Over-dimensioned arrays in commons were adjusted reduced
         to really needed arrays


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     New in Version 18.10.07

       * In the pattern data statements now on Cards A 19 yields
         are addressed ! Now fission product yields are used for

         Th232, U 233, U 234, U 235, U 236, U 238, Np237,  Np238,
         Pu238, Pu239, Pu240, Pu241, Pu242, Am241, Am242m, Am243,
         Cm243, Cm244, Cm245

       * Flux irradiation (index = 1) of Am241 showed a non-
         conservation of total AC+FP mass due to the fact that

         (a) KORIGEN uses only 19 fissionable nuclides yielding
             fission products
         (b) fissionable nuclides are generated from Am241 which
             have no yields in KORIGEN

         Since no further yields are available at the time being,
         a timestepwise mass rebalancing to keep the total mass
         constant is performed. From the physics point of view
         this corresponds to asigning  a v e r a g e d  yields
         to the non-yield fissionable actinides (subr. fpnorm).
         Each FP nuclide concentration is multiplied by the same
         rebalancing factor.

       * Flux irradiation with ISP = 4 (Thermal 2200m/s cross
         sections) now is done in the fast reactor mode (nlibe=3).
         A test print-out of the AC transition matrix was made
         to ascertain the application of 2200m/s x-sections from
         of the THERMAL library in file KORITHM.i; there problems
         with "Daughters and corresponding Mothers" (not relevant
         for webKORIGEN)

       * In subr. NUDATA for ISP = 4 x-sections from KORITHM.i
         are taken, x-sections from ORFI are suppressed

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